Update appStore/prep_data.py

appStore/prep_data.py

@@ -58,11 +58,27 @@ def process_giz_worldwide():
         'duration.project.end': 'end_year'
     })
     
-    # Convert end_year if it is stored as a numeric epoch (in ms) to "YYYY-MM-DD"
     def convert_to_date(val):
-        if isinstance(val, (int, float)):
-            return datetime.utcfromtimestamp(val / 1000).strftime("%Y-%m-%d")
-        return val  # Already a string
+        try:
+            # If val is a string, first check if it represents a numeric value.
+            if isinstance(val, str):
+                val_str = val.strip()
+                try:
+                    # Try converting the string to a float (i.e. it’s an epoch in string form)
+                    num = float(val_str)
+                    return datetime.utcfromtimestamp(num / 1000).strftime("%Y-%m-%d")
+                except ValueError:
+                    # Not a numeric string; assume it's already a date string in "YYYY-MM-DD" format.
+                    # Optionally, you can validate it:
+                    datetime.strptime(val_str, "%Y-%m-%d")
+                    return val_str
+            elif isinstance(val, (int, float)):
+                return datetime.utcfromtimestamp(val / 1000).strftime("%Y-%m-%d")
+            else:
+                return "Unknown"
+        except Exception:
+            return "Unknown"
+
     
     giz_df['end_year'] = giz_df['end_year'].apply(convert_to_date)